At around 9 a.m., the unidentified man, wearing a black hoodie and a black cap, entered the branch on River Street, walked to a counter, grabbed an envelope and began writing a note, a police statement said. The suspect then slipped a bank teller the note, which demanded money.

By the time police arrived, the suspect had escaped. As of Tuesday afternoon, there was little additional information, said Capt. Peter Busciglio. It was unknown whether the suspect had used a car to make his getaway or stayed on foot, he said.

"All we have is the description we gave out," Busciglio said.

The suspect was last seen going north on River Street, police said.

The FBI was called and responded to the bank, Busciglio said. Hackensack police are leading the investigation.